It's been 6+ months now since I broke up with my ex boyfriend

But I never thought that it was gonna be this hard. I was in love with him, I thought he was the one. But then I found out that he was cheating on me. And then I found out that he didn't do it once, infact multiple girls, multiple times and it broke my heart. I'm just 16. I barely know anything about love but I sure know what a heart break feels like. I feel so stupid and was I not good enough for him? I don't know why he did it but now, we hate eachother and it affects me a lot because I was so used to him loving me and just being there for me. I hate to be this way, I hate to feel needy and unloved. Well, atleast I'm not pregnant ✊🏼